Grinding wheel dressing device



Jan. 8, 1946. a HELDW I 4 2,392,668

GRINDING WHEEL DRESSING DEVICE Filed Oct. 2, 1943 16256454 455 5; 65 ,1 gm v 449 Jmm 6a hmbZcZ/y' *6 m 6 Patented Jan. 8, 1946 UNITED STATES PATENT OFFICE 2,892,668 camnmo warm. nanssma DEVICE Gustave Holding, Chicago, Ill.

Application October 2, 1943, Serial No. 504,657

'iClaims.

This invention relates to improvements in grinding wheel dressing devices and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

One of the objects of the present invention is justed to provide either a relatively small arc,

as for the corners of the peripheral face of the wheel, or any one of a number of larger arcs for the cross sectional shape of said lace.

Furthermore it is an object of the invention to provide a device of this kind which is of simple construction and is easily manipulated in adjusting the same and which positively holds the position into which it is adjusted so that the desired dressed face of the wheel is true and accurate, about its entire periphery.

The above mentioned. objects of the invention, as well as others, together with th many advantages thereof will more fully appear as the specification proceeds.

In the drawings:

- Fig. 1 is a top plan view of a grinding-wheel dressing device, on a full size scale, embodying the preferred form of the invention.

Fig. 2 is a longitudinal vertical view through the device as taken substantially on the line 2-2 of Fi 1, parts being in section and parts in elevation, illustrating the manner of setting the device for a dressing operation.

Fig. 3 is a detail longitudinal vertical sectional view through parts oi the device shown in Figs.

Fig. 4 is a perspective view of a certain gauge stem forming a part of the. device and which will be more fully mentioned later.

Fig. 5 is a detail transverse vertical sectional view through a part of the device as taken on the line 55 of Fig. 1. I

In general the improved device is, one for dressing grinding wheels as embodied in certain machines capable of accurate grinding of machined parts. It includes a base adaptedto, be secured in a fixed position with respect to the wheel to be dressed and a swing piste" having a pivotal connection therewith so as to swing inan are relatively to the base, to either side of a predetemiined position thereon.

The swing plate has a perpendicular post thereon in which a tool, with an abrasive point such as a diamond, is mounted for adjustment toward and away from a gauge stem and by which the radius of the curve or'arc to be made by the point may be accurately determined.

Referring now in detail to that embodiment of the invention illustrated in the drawings, the improved device includes an elongated rectangular base ill and a swing plate ll spaced above the same. The swing plate is somewhat longer than the base plate so as to overhang the same at one end where it is provided with a handle l2.

The swing plate has a pivotal connection at its other end upon the base so as to be capable of a lateral swinging movement, to one side and the other of a predetermined position wherein the longitudinal edges of the base and swing plate coincide. This connection includes a bushing or stud it having an axial bore l4 and the lower end ii of said stud is threaded into an opening IS in the base. About the upper end of the opening I6 is a shallow recess l1 and in which engages a boss ill on the bottom end of one of a pair of lower and upper spacers l9 and 20 respectively. The spacer I9 is attached to the base III by means of screws 2| that pass up through the base from below. The spacer 20 includes an extension 20 that passes up through that end of the swing plate ll, opposite the handle 12 to provide a bearing for a swinging movement thereof.

The top end of the stud l3 carries a radial flange 22 and disposed between said flange and the top surface of the swing plate is a washer-like disc 23.

When the bottom end l5 of the stud is threaded into the opening it in the base plate, said studs hold the part together in assembled relation so that the swing plate may be swung laterally in' either direction from the predetermined position before mentioned and as appears in Fig. 1.

To hold said base and plate in this predetermined position I provide in one margin of each thereof, aligned openings 24 and 25 respectively, as shown in Fig. 5. A pin 26, having a head 21, is inserted through the opening 25 so that its bottom end enters the opening 24. This assures the alignment of'said plates. A finger actuatable set screw 28 has threaded engagement through one side edge of the plate I I so as to engage the pin 26 and hold the same in place. when it is desired to swing the plate I I laterally, in either direction from the position shown in Fig. 1, the screw 22 is loosened and the pin 26 is pulled upwardly and freed from the hole 2| where it may be locked in the freed position by again tightening the screw 23.

Rising from the top side of the swing plate, on the median line thereof, is a tool or supporting post 33. The bottom end of this post has a threaded boss 3| which is engaged in a threaded opening 32 in said plate If. A similar opening 33 is provided in the plate a greater distance away from the axis of the pivotal connection before mentioned than is the opening 32. The boss 3| is locked in the opening 32 or 33, as the case may be, bymeans of a set screw 34 as in Fig. 1.

In the top end of the post 30 is a transverse hole 35 which snugly receives a stem-like tool 38 which may be moved back or forth through said hole for adjustment and then looked in the ad- Justed position by a finger actuatable screw 31. One end of this tool is pointed as at 38 and this end of said tool is directed toward the axis of the pivotal connection between the base I and plate I I. The tip of said tool end is provided with an abrasive element 33 that is hard enough to cut a grinding wheel. A commercial diamond well serves as the element 39.

In Fig. 4 is illustrated in perspective a gauge stem 40 of substantial length and of a diameter to have a snug fit in the bore H of the bushing or stud l3. One side of the upper end of this stem is cut away to form a flat face 4|, the plane of which includes the axis of the stem. In the same side of the stem toward its lower end is located a recess 42 presenting a flat surface as shown in Figs. 2 and 4.

when the stem 40 is in place with its bottom and disposed in the bore l4 of the bushing or stud l3, its top end flat face 4| should stand in a plane perpendicular to the axis of the tool 36 when'the base I0 and plate Ii are in the predetermined position before mentioned. To assure that the face 4| is so positioned, I provide-means on the swing plate that coact with the recess 42 and such means is as follows:

Rising from that side of the swing plate opposite the set screw 34 is a boss 43 having a longitudinally extending opening 44 therein. This boss carries a. bottom end stud 45 that fits in anopening' in the swing plate II and is secured therein by a set screw 41 as indicated in dotted lines in Fig. 3. Below and parallel with the opening 44 is another and smaller opening 43 in which one end of. a pin 49 has a drive fit; the other end extending toward the handle end of the swing plate H.

A stem 50 has a sliding rotative bearing in the bore 44 and one end carries a right'angled stop arm Ah expansion spring 52 surrounds the stem between the boss 43 and arm 51 and normally urges the stem 5|! and arm 5| toward the left as viewed in FigsJZ and 3. The stop arm is so formed that when its free end traverses the median line of the plate as'shown' ih Fig. 1, one side of the arm will engage in the recess 42 o! the stem 43 asv shown in Fig. 2. When so enaged. this. assures that the face 4| at the top end of said stem,v stands perpendicularly to the axis of the tool when the two plates li and ii coincide at the edges.

The other the stem 50 has one end 53 of at tubular body secured thereto and this end is; mrmed as a radial flange in which is a longit-udinal openings;- The other end of saidibody i'sdirmed as a knurled finger grip it. The Hopeniim'li is so formed asto the pin 43 td pass tberethrough the. W I4 is turned so that the opening $5 pin.

body is pulled or drawn to the right, as shown in Fig. 3 and then turned about the axis of the stem 50, the stop arm is withdrawn from the recess 42 and the opening 55 is moved out of register with the pin 49. The parts are thus held in the retracted position shown in Fig. 3 wherein the spring 52 is in compression.

Assume that it is desired to dress the peripheral corners of a grinding wheel so that said corners will have a curvature of say 3%" in diameter. The base l0 and plate II are secured in the predetermined position before mentioned, by use of the pin 26 as before described. The stem 43 is then disposed in the bore i4 and is turned so that its face 4| is approximately perpendicular to the axis of the tool stem 36. The body 54 is then manipulated to dispose the stop arm 5| in the recess 42 of the stem 40 and this not only assures the perpendicularity of the face 4| relative to the tool 36 but detachably locks the gauge stem 40 in place. The stem is further locked against turning by reason of the engagement of the pin 49 in the opening 55 of the flange 53. One or more thickness gauge blocks 51 (see Fig. 2), usually found in every machine shop, providing a thickness of z?!" is then held flatwise against the face 4| of the stem 40, after which the tool 36 is moved toward said block until the abrasive element 39 engages therewith and the tool is then looked in place by tightening the screw 31. The thick- I ness block 51 is then removed and this leaves the element 39 spaced from the axis of the bore I4 in the stud l3 and which is also the axis of the pivotal connection between the base. and wing plate. The body 54 is then pulled to the right far enough so that the flange 53 clears the pin 49, after which said body is turned clockwise so that the opening 55 in the flange 53 moves out of register with the pin as shown in Fig. 3. This releases the stem 40 which is then removed from the bore H in the stud l3.

The device as a whole is now moved into a position adjacent one corner of the periphery of 'the wheel to be dressed so that the element 39 is properly positioned with respect thereto. The set screw 28 is then loosened and the pin 26 withdrawn from its engagement in the hole 24 in the base ID and then locked in the withdrawn position by again: tightening the screw 28. The swing plate II is now free to swing about the pivotal connection with the base and as the element 39 has been positioned 5' of an inch from the axis of said connection, it will, when the plate II is swung laterally, round oil? the comer of the grinding wheel so as to have a radius of It is apparent thatby adjusting the tool 36 in the post 30 outwardly or to the right. as shown in Fig. 2, the cutting diameter afforded by the element 39 is increased. However, each time an adjustment is to bemade, the stem 40 is replaced as before mentioned and the gauge block is used to make the adjustment.

with the post 30 disposed in the opening 32, adjustments forming minute radii, say substantially zero to one over an' inch may be afiorded.

. If a larger radius is desiredl for the element 33,

the postifl is removedii'romthe opening 32 and disposed in the opening? 333.

The device is accurate and assures precision setting of the element 331mm substantially zero to indeed; relatively large: diameters whereby a multitude of dressed faces mayr be provided on grinding wheels.

describing tlie' inyention I have reconstruction of the parts involved, the same is to be considered only in the illustrative sense so that I do not Wish to be limited thereto except .as may be specifically set forth in the appended claims.

I claim as my invention:

1. A device of the kind described embodying therein a base, a plate disposed above the base and having a pivotal connection therewith for a lateral swinging movement out of and into a predetermined position relative to the base, a stem' removably mounted on the base coaxially with said pivotal connection and extending above said plate and having a surface portion coincident with the axis of said pivotal connection, and a transverse recess below said surface portion, a tool having a wheel cutting element at one end thereof mounted on said plate for adjustment toward and away from said surface portion, and manually operable means engageable in and disengageable from said recess in said stem for detachably securing said stem against axial withdrawa1 from and against turning relative to said base. i

2. A device of the kind described embodying therein a base, a plate having a plurality of spaced tool-post receiving apertures disposed above the base and having a pivotal connection therewith for a lateral swinging movement out of and into ting element at one end thereof slidably mount-- ed in the free end of said tool post, for adjustment toward and away from said surface portion, means engageable and disengageable in said recess in said stem for detachably securing the stem to the base with said flat surface portion in a definite position relative to said tool when said plate is in a predetermined position on the base and prevent axial withdrawal therefrom, and means for releasably locking said plate in a predetermined position on said base.

3. A device of the kind described embodying therein a base, a plate disposed above the base and having a pivotal connection therewith for a lateral swinging movement intoand out of a predetermined position on the base, a stem removably mounted on the base coaxially with said pivotal connection and extending above the plate and having a fiat surface portion coincident with the axis of said pivotal connection, and a transverse recess below said surface portion, a tool having a wheel cutting element atone end thereand out of a predetermined position on the base,

said pivotal connection including a bushing fixed to the base and having a bore therein, a stem removably disposed at one end in said bore and having its other end extending above said plate,

the upper end portion of said stem having a flat surface portion coincident with the axis of the pivotal connection, a tool having a wheel cutting element at one end thereof mounted on the plate for adjustment toward and away from said surface portion, said stem having a recess at one side thereof below said fiat surface portion, means mounted on said plate and including a part engageable in the recess in the stem for holding the same in a definite position in said bore and prevent withdrawal therefrom, and means carried by said plate for locking said plate to said base when said tool is being adjusted relative to I said surface portion.

5. A device of the kind described embodying therein a base, a plate disposed above the base and having a pivotal connection therewith for a lateral swinging movement into and out of a predetermined position on the base, said pivotal connection including a bushing fixed to the base and having a bore therein, a stem removably disposed at one end in said bore and having its other end extending above said plate, the upper end portion of said stem having a flat surface portion disposed coincident with the axis of said, pivotal connection, the stem having a recess in one side below said flat surface portion, a tool having a wheel cutting element at one end thereof mounted on the plate for adjustment toward and away from said flat surface portion, and means carried by said plate and adapted to be removably engaged in said recess for holding the stem in a position'with said flat surface portion perpendicular to the tool.

6. The device according to claim 2, wherein means are provided to lock said tool in said tool post after adjustment. I

7. The device according to claim 3, wherein said pivotal connection includes a bushing fixed to said base and having an axial boretherein in which one end of said stem seats. 

